Induction coil



Patented Oct. 27, 1925.

UNITED STATES rPn'rr'nvr OFFICE.N

DEELBERT A. REYNOLDS, OF `WEST HOBOKEN, NEW JERSEY, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO AUDIPHONE COMPANY OF AMERICA, OF NEW YORK, N. Y., A COR- ronATIoN `or DELAWARE.`

INDUCTION COIL.

Application led November 22, 1917, Serial No. 203,382. Renewed April 17, 1925.

T0 all 'oo/10m it may concern:

Be it known that I, DE ELBnnT A. REYN- oLDs, a citizen of the United States of America, residing at )Vest Hoboken, county of Hudson, State of New Jersey, have invented certain new and useful Improvements in Induction Coils, of which the following is a specification.

The object of this invention is to provide an improved simple and effective means for exciting a. plurality of secondary circuits from a primary winding, and the synchronizing of a number of primary circuits with one or more secondary circuits, being especially useful where it is desirable to employ a number of receivers in connection with a single transmitter, or to convey to a single or multiplicity of receivers the harmonic vibrations or voice currents from a pluralit7 of transmitters.

In its simplest form, the invent-ion may be called a multiple induction coil, composed of a Single primary and a multiplicity of secondary windings, so disposed as to induce an independent secondary current in each secondary winding. I have found such arrangement far more eilicient than connecting a plurality of receivers in series or multiple upon the line, as is now in common practice.

A varied form of this inventionfmay be called a multiplex induction coil, in which two or more independenty primary windings are suitably wound upon 4 the same core (preferably laminated) and the plurality of primary windings continuously surrounded by the secondary winding or windings, yielding one or more induced currents, essentially the synchronized or harmonically reproduced vibrations of all the primary circuits. I have found this form of the invention especially useful in harmonizng thervibrations from two or more transmitters in the transmission 0f music from several instruments, the synchronizing of the vibrations from several sensitive transmitters in rostrum or stage equipment and a variety of uses analogous to the telephonie art.

I do not, however, confine the location of the primary windings to the proximity of the core, as satisfactory results are obtainable by placing the primary windings intermediate the several secondary windings,

especially where a multiplicity of secondary windings are employed. These windings connect with suitable terminals mounted upon the end pieces or frame of the coil.

Further features and objects of the invention will be understood from the following description land accompanying draw- Fig. 4 is an end view showing a varied form of windings; and

Fig. 5 is a diagram showing one form of -the .use of the invent-ion.

, Referring to the drawings, in Fig, 1, l represents the end pieces or frame-work of an induction coil, made of wood or fibre, having central recesses into which are inserted the laminated core 2, around which is ordinarily wound the wire constituting the primary winding 3, which is usually covered by thin insulation, of paper or the like (not shown in the drawings) upon which the smaller wire constituting the secondary windings 4-,is wound all wires of both primary and secondary being provided .with suitable terminals (not shown in the drawings) which may be mounted upon the end pieces or frame-work of the coil. Theconnections of the respective terminal and secondary windings are shown in the diagram of Fig. 5. l

Ordinarily, each secondary winding, having its independent terminals, is separated from the adjacent secondary winding or windings by thin paper insulation the final layer being covered with a suitable dampproof covering, as in the ordinary manner. In the varied or multiplex formas shown in Fig. 3, the primary windings 3', 3, 3', are separated by small paper or fibre washers 5, placed snugly upon the laminated core 2, in such manner as to effectively separate the primary windings the terminals for which are usually mounted on one of the end pieces; the wires of the primary windings are carried to the terminals next to the core; the fibre washer is of a. size suflicient -toseparate the primary windings, but allow each secondary winding to extend from end to end of the coil, suitable terminals for the respective secondaries being preferably provided on the end pieces ofthe frame l, op-

posite theterminals of the primaries.

' In Fig. 4 I have indicated the innermost secondary winding neXt to the core 2, and the primary winding 7, intermediate between said secondary windings G, outermost and the secondary windings 8.

- In Fig. 5 I have indicated the invention as employed with a plurality of sound recel-ving devices and a plurality of sound emitting devices, such as for a stage, rostrum, church and general auditorium purposes. For example, 10, 11, 12 may be sound receiving devices positioned at desired spaced points on the stage, rostrum or the like, the wiring 13 of the electrical element of device 10 being connected to the terminals of primary 3'; similarly the wiring 14 of the electrical element of device 11 being connected to the terminals of the primary 3, and the wiring 15 of the electrical element of device 12 being connected to the terminals of the primary 3, said secondaries being arranged in accordance with Fig. 3, as more fully described hereinabove. The electricallly actuated sound emitting devices v16, 17, 18 are suitably connected to respective sec'- ondaries, such as the ywiring 19 of the electrical element of device 16, being connected to the terminals of the secondary 4, the wir- `ing 2O of the electrical element 17 being consaid devices in close proximity to one another to receive sounds emanating from a single source, an induction coil comprising a plurality of primary windingsmeansconvnecting said primary windings respectively with said telephone transmitters, said induction coil further comprising a plurality -of secondary windings in inductive relation with said primary windings and separate telephone receiversconnected'to said secondary windings.

2. The combination of a plurality of telephone transmitters, means for mounting said devices in close proximity to one another to receive sounds emanating from ra single source, an induction coil comprising a plurality of primary windings, vmeans connecting said primary lwindings respectively with said telephone transmitters disposed in spacial relation to one another longitudinally ofthe induction coil, sa'id induction coil further comprising a plurality of secondary `windings in inductive lrelation with said primary windings and separate telephone receivers connected 'to said secondary windings.

3. The combination 'with a central core, of a plurality of primary windings disposed without said core, said lprimary windings being disposed in -spacial relation to one another longitudinally of the core, separate energizing circuits for said yprimary windings, each of said Acircuits Aincluding an acoustically responsive device, a plurality of Vsecondary windings disposed without said core and in substantially equivalent inductive relation with said primary windingsrespectively, said windings being disposed in yspacial relation to one another transversely of the length of said core, and electrically-responsive acousticaldevices separately controlled by said secondary windings respectively. p

In testimony whereof I have signed this specification thisQOth day of November 1917.

Dn ELBERT A. REYNOLDS. y 

